Delivery device for threads on weaving machines, knitting machines, or the like

ABSTRACT

A delivering device for threads on weaving machines, knitting machines, or the like, which comprises a motor and a drum which is rotated by the motor and adapted to store intermediately a predetermined thread supply prior to each thread removal. A thread supply surveillance device is arranged for stopping the motor upon reaching a nominal-thread supply. The motor comprises an asynchronous two-phase motor. A current valve circuit is provided for feeding current to the motor. The surveillance device emits a motor stopping-command signal in both phases in the stopping position, and the current valve circuit is transferred by the command signal for either positive or negative half-waves.

United States Patent Vischiani [451 June 20, 1972 Giuseppe Vischiani, Como, Italy Firma Sobrevin Soc. deBrevets Industriels, Mauren, Liechtenstein April 16, 1910 Inventor:

Assignee:

[30] Foreign Application Priority Data June 10, 1969 Germany ..P 19 29 485.0

US. Cl. ..242/47.l2, 66/132 R, 139/122 R Int. Cl ..B65h 51/20 Field of Search ..242/47.12, 47.13, 47.01, 47.08, 242/4709, 45, 75.5, 75.51, 75.52; 226/10, 24; 139/122 R; 318/6; 66/132 R [56] References Cited UNITED STATES PATENTS 2,914,262 11/1959 Ludvigsen ..242/45 X 2,981,491 4/1961 Eans ..242/45 3,225,446 12/1965 Sarfati et al.... .242/47.12 X 3,233,397 2/1966 Bonikowski ..242/45 X Primary ExaminerStanley N. Gilreath AttorneyEmest G. Montague 57 ABSTRACT A delivering device for threads on weaving machines, knitting machines, or the like, which comprises a motor and a drum which is rotated by the motor and adapted to store intermediately a predetermined thread supply prior to each thread removal. A thread supply surveillance device is arranged for stopping the motor upon reaching a nominal-thread supply. The motor comprises an asynchronous two-phase motor. A current valve circuit is provided for feeding current to the m0- tor. The surveillance device emits a motor stopping-command signal in both phases in the stopping position, and the current valve circuit is transferred by the command signal for either positive or negative half-waves.

6 Claim, 3 Drawing Figures PATENTEDJUHZO m2 SHEET 10F 2 Fig.7

/N VE N TOR.

PATENTEDJum m2 SHEET 2 [IF 2 INVENTQR.

DELIVERY DEVICE FOR THREADS ON WEAVING MACHINES, KNITTING MACHINES, OR THE LIKE The present invention relates to a delivering device for threads on weaving machines, knitting machines or the like, in which a predetermined thread supply is stored inten'nediately prior to each thread removal on a drum driven by an electric motor and the electric motor is stopped by a surveillance device of the thread storage upon reaching the nominal-thread storage.

In such delivering devices, the thread supply must be wound in a special arrangement, suitable for a quick and possibly tension-free thread removal on the drum, for example, the drum can only be wound in one layer. If the nominal-thread supply is reached, the drum must be stopped immediately, so that by a superfluous thread length the prescribed winding length is not disturbed, for example, a second winding layer arises. Thus, it is demanded from the drum drive, that it comes to a standstill as quickly as possible upon obtaining the signal nominal-thread supply reached, and that it fills up again, on the other hand, the nominal-thread supply safely again the intermediate time periods. Since the drum has only a low weight, and thereby a low inertia, an electric motor of comparatively low output suffices as a drum drive, in particular, since due to the axial removal of the thread no acceleration forces are exerted on the drum. I

It is one object of the present invention, to provide a delivering device for threads on weaving machines, knitting machines or the like wherein a control device for the drum drive, which control device is properly functioning, is created with only a minimum constructive expenditure. Starting from the delivering device as a generic designation, this object is brought about in accordance with the present invention, such, that an asynchronous two-phase-motor is provided as a drum drive, the current feeding of the motor taking place by means of a current valve'circuit, which is transformed by the motor stopping-command signal of the surveillance device in both phases in the locking state, either for the positive or the negative half-waves.

It is another object of the present invention, to provide a delivering device for threads on weaving machines, knitting machines, or the like, wherein the current valve circuit is locked, in addition to both phases for the half-waves of one sign, also in connection with a phase for the half-waves of the other sign.

By the locking of the current valve circuit, the electric motor is fed only with half-waves of one sign, and thereby preferably only still with half-waves of one phase, whereby a rapid braking is obtained in dependency upon the signal of the surveillance device.

In a constructive realization of the present invention, it can be provided, that the current valve circuit contains for each phase two diodes disposed anti-parallel in the exciting current circuit, of which the diodes adapted for the feeding of the positive half-waves are controllable in dependency upon the command signal of the surveillance device. If the diodes are locked during the positive half-waves, the electric motor is fed in both phases only with the negative half-waves and thereby, a braking of the motor is released.

In accordance with the present invention, however, also the negative half-waves of the phase moving with a time-lag can be guided by a controllable diode, disposed in the exciter circuit of the phase leading in phase, so that also the negative half-waves of this phase can be locked likewise in dependency upon the command signal of the surveillance device, whereby the brake effect is still increased.

As a surveillance device, a photoelectric arrangement can be provided in known manner, the signal voltage of which releases an occurrence of a locking voltage at the grids of the controlled diodes.

In accordance with an essential further development of the present invention, it is furthen'nore provided, that the length cuit with a variable resistance. By this arrangement, the number of revolutions of the electric motor is settable stepless between zero and a maximum number of revolutions.

Of particular advantage is in the present invention the feature that the adjustability of the number of revolutions of the motor and the braking of the motor are obtained in dependency upon the signal of the surveillance device with a low constructive expenditure and even solely with a comparatively simple electronic circuit, and that the use of a variable speed gear connected with the rotor shaft is superfluous.

With these and other objects in view, which will become apparent in the following detailed description, the present invention, which is disclosed by example only, will be clearly understood in connection with the accompanying drawings, in which:

FIG. 1 is a schematic top plan view of a delivering device, designed in accordance with the present invention;

FIG 2 is a circuit diagram of the control circuit for the drive of the delivering device; and

FIG. 3 is a circuit diagram of a testing device for determination which of the phases is leading in phases.

Referring now to. the drawing, and in particular to FIG. 1, the delivering device comprises a rotating drum 1, which has a truncated cone-shaped receiving phase 1' and a cylindrical phase 1", following the phase 1 in forward direction. Pre-set to the truncated cone-shaped receiving phase 1', is a cylindrical drum section 1". Within the forward range of the drum is provided a brake ring 2. The drum 1 is brought into rotation by an asynchronous two-phase-motor. The control therefor takes place by means of a light gate. The light source 3 operates in cooperation with a photocell 4, disposed inside of the drum 1. The drum wall is formed transparent for the passage of the light ray at least in its passage range. The possibility exists, however, also to form the drum surface of reflecting material, so that the light ray impinges from the outside and is reflected into the likewise outside disposed photocell. The revolutions of the drum 1 can be counted by means of a counter. Adjacent to the drum 1 is arranged a thread guiding roller 6. The thread 7 moves with its section 7 within the range of the cylindrical surface area 1" of the drum 1. Upon a multiple part winding and deviation by the roller 6, the thread moves towards the truncated cone-shaped receiving phase 1'. After a plurality of rotations of the drum 1, a predetermined winding supply 7" of thread material has been formed, thereby, on the cylindrical drum section 1". Upon reaching such nominal thread supply, the light gate 3, 4 is rendered operative, which stops the drum 1.

The thread 7" is removed in axial direction below the brake ring, which leads to a slip-elastic drum engagement of the thread 7 If the thread supply, due to its removal, follows below the provided minimum supply, the drum starts again rotation, caused by the control of the light gate 3, 4.

Referring now again to the drawing, and in particular to FIG. 2, which shows the control circuit, by means of which, the photocell 4 controls the two-phase-motor with the windings A, and A Furthermore, the circuit according to FIG. 2 contains a time-switching circuit 8 with a variable resistance 9 for the stepless setting of the number of revolutions of the motor.

The motor feed takes place by means of a current valve circuit 10, which includes for each phase two anti-parallel disposed diodes D, and SCR,, and D and SCR,, respectively. Concerning the diodes SCR and SCR,, which are coordinated to the positive half-waves, one deals with controllable diodes, particularly with four-layer-switch-diodes. The cathodes of both controllable diodes SCR and SCR: and the anode of the diode D are connected to a distributing wire 11, which is connected by means of a diode D to the zero-conduit 0" and to the anode of the diode D,.

If the controlled diodes SCR and SCR, are opened during the positive half-waves, the positive half-wave of the voltage V flows through the winding A and the diodes SCR, and D to the joint neutral wire 0". The negative half-wave of the "9" flows independently from the control of the diodes SCR, and SCR over the diode D,. During the positive halfwave of the voltage V,, the current l flows over the winding A,,, the diodes SCR, and D to the joint neutral wire. During the negative half-wave the current flows over the diodes D SCR, and D,. Under these conditions, the voltages V, and V are delivered fully (reduced by the voltage drop of the diodes) to the windings A, and A so that the maximum number of revolutions of the motor results.

If the diodes SCR, and SCR are locked during the positive half-waves, the current 1 can not flow any more. The current I, flows only through the diode D,, thus only in one direction. Under these circumstances, a maximum braking of the motor results, by which the number of revolutions of the motor is reduced quickly to zero.

If both diodes SCR, and SCR, are controlled between these two above-described extreme states completely open or completely closed during all positive half-waves if these diodes are more or less opened for a long period during the positive half periods, the motor can be driven with any selected median number of revolutions.

The setting and control of the opening periods of the two diodes SCR, and SCR, is now more clearly described as follows:

A positive collection wire 12 is connected by means of a diode D, to the winding A, and furthennore by means of the diode D, and the two equally large resistances R, and R to the winding A,. Between the two collection wires 11 and 12 are disposed in series, a resistance R, and a transistor T,, which is conducting during the positive half-waves of V, and V Consequently the condenser C separated from the resistance R, bymeans of a diode D and disposed parallel to the resistance R charges itself by means of the resistance R,,,. In the time interval, in which both voltages V, and V, are negative, the transistor T, is locked and the condenser C discharges over the resistance R 7 During charging of the condenser C the threshold-voltage settable by means of the variable resistance 9 occurs on the transistor T The transistor T becomes conducting and brings 4 an ignition voltage to the emitters of the two controlled diodes SCR, and SCR, by the transistor T, switchedby means of the emitter amplifier and the resistances R and R By adjustment of the threshold-voltage at the transistor T the time interval can thus be set, by which time interval the control diodes SCR, and SCR, are at first retarded upon occurrence of a positive half-wave of V, (transistor T, becoming conducting) and can be switched into the conducting state. By setting of the variable resistance 9, the number of revolutions of the motor can be set stepless.

The direct stopping of the motor running at any selected number of revolutions is released by the signal of the surveillance device, in the present embodiment by the photocell 4. The positive signal voltage of the photocell 4 is delivered to the base of the transistor T switched between the two collecting wires 11 and 12, which transistor T becomes thereby conducting and simultaneously switches the transistor T, into the conducting state. The condenser C discharges now quickly by means of the transistor T, and the resistance R,,,, so that the threshold-voltage cannot build up on the transistor T,, as long as the signal voltage is present at the photocell 4.

In the above description, it has been stated that the transistor T is maintained in a conducting state in the positive range'of the half-waves of the voltages V, and V This is in effect upon performed ignition of the diode SCR,, which controls by means of the diodes D, and D, the emitter of the transistor T,. In the state prior to becoming conducting of the diode SCR,, the emitter of the transistor T, (collection conduit ll of the circuit) can then become negative relative to the joint neutral wire, if V is smaller than V By this arrangement, an advance is caused during the charging of the condenser C, relative to the occurrence of a positive voltage at the anode of the diode SCR,, whereby a voltage can be applied at its grid, which opens the transistor SCR, for the entire duration of the positive half-wave. In order to exclude this faulty operation, V, must be the advancing phase relative to FIG. 3 discloses an examination circuit, by which it can be determined, which phase is the advancing phase. The examination circuit comprises the series arrangement coordinated to the phase V and comprising a condenser C and resistance R and the series arrangement coordinated to the phase V comprising a resistance R and condenser C and a switching arrangement with the transistors T and T as well as an incandescent lamp 13, which is connected, on one side, by means of diodes l4 and 15 to the phases V, and V, and, on the other side, to the collectors of the transistors T and T The base of the transistor T is connected by means of a resistance R and R to the switching point between the resistance R and the condenser C and the resistance 31 and condenser 31, respectively, while the emitter of the transistor T is connected with the base of the transistor T The emitter of the transistor T is connected to the neutral wire 0, with which are connected also the resistance R and the condenser C Upon suitable dimensioning of the switching elements, the transistor T does not receive a signal, if the phase V, advances for, by example, of the phase V and consequently the incandescent lamp 13 does not light up. If, however, the phase V, runs ahead of the phase V,, the transistors T and T become conducting and the incandescent lamp 13 lights up. The incandescent lamp 13 lights up also upon omission of a phase, however, with a weaker light. With the assistance of the examination circuit of FIG. 3, thus a correct connection of the control circuit in accordance with FIG. 2 can be performed.

While I have disclosed one embodiment of the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense.

lclaim:

1. A delivering device for threads on weaving machines, knitting machines, or the like, comprising a motor,

a drum rotated by said motor'and adapted to store intermediately a predetermined thread supply prior to each thread removal,

a thread supply surveillance device for stopping said motor upon reaching a nominal-thread supply,

said motor comprising an asynchronous twophase motor,

a current valve circuit for feeding current to said motor,

said surveillance device emitting a motor stopping-command signal in both phases in the stopping position, and

means for transforming said current by said command signal for one of positive and negative half-waves.

2. The delivering device, as set forth in claim 1, wherein said current valve circuit is locked in both phases for said half-waves of one sign and also in a phase for said halfwaves of the other sign.

3. The delivering device, as set forth in claim 1, wherein said current valve circuit comprises for each phase twodiodes disposed anti-parallel in an exciter current circuit, and

said diodes determined for the conduit of the positive halfwaves are controllable in dependency upon said command signal of said surveillance device.

4. The delivering device, as set forth in claim 3, further comprising means for moving said negative half-waves of the phase with a time-lag over said controllable diode in said exciter current circuit of the phase moving ahead in phase, and for locking by said command signal.

5. The delivering device, as set forth in claim 4, wherein said surveillance device comprises a photoelectric device,

and

the signal voltage of the latter releases an occurrence of a locking voltage at the grids of said controlled diodes.

6. The delivering device, as set forth in claim 5, which includes a transistorized time switching circuit with a resistance operatively connected to said current valve circuit such that the length of the opening times of said controllable diodes falling into the positive half-waves is adjustable by it kt k 

1. A delivering device for threads on weaving machines, knitting machines, or the like, comprising a motor, a drum rotated by said motor and adapted to store intermediately a predetermined thread supply prior to each thread removal, a thread supply surveillance device for stopping said motor upon reaching a nominal-thread supply, said motor comprising an asynchronous two-phase motor, a current valve circuit for feeding current to said motor, said surveillance device emitting a motor stopping-command signal in both phases in the stopping position, and means for transforming said current by said command signal for one of positive and negative half-waves.
 2. The delivering device, as set forth in claim 1, wherein said current valve circuit is locked in both phases for said half-waves of one sign and also in a phase for said half-waves of the other sign.
 3. The delivering device, as set forth in claim 1, wherein said current valve circuit comprises for each phase two-diodes disposed anti-parallel in an exciter current circuit, and said diodes determined for the conduit of the positive half-waves are controllable in dependency upon said command signal of said surveillance device.
 4. The delivering device, as set forth in claim 3, further comprising means for moving said negative half-waves of the phase with a time-lag over said controllable diode in said exciter current circuit of the phase moving ahead in phase, and for locking by said command signal.
 5. The delivering device, as set forth in claim 4, wherein said surveillance device comprises a photoelectric device, and the signal voltage of the latter releases an occurrence of a locking voltage at the grids of said controlled diodes.
 6. The delivering device, as set forth in claim 5, which includes a transistorized time switching circuit with a resistance operatively connected to said current valve circuit such that the length of the opening times of said controllable diodes falling into the positive half-waves is adjustable by said transistorized time switching circuit. 